What do dietitians and nutritionists do, their schooling, etc?

I’m doing a school project or report on dietitians and nutritionist. If you could send me information on what they do, their schooling and just about everything you have on them I would really appreciate it. All the stuff on the internet is stuff on how to lose weight or what’s the right stuff to eat etc. Thanks!
You can check the Academy of Nutrition and Dietetics. Click on the links about a career in dietetics